An action potential in a neuron begins when
A) a threshold potential is reached.
B) the resting potential is established.
C) gated sodium channels close.
D) when gated potassium channels close.
E) more than one of these occur.

Question

Quizplus · Accepted Answer

An action potential in a neuron begins when a threshold potential is reached. This occurs when the depolarization of the membrane potential reaches a critical level, causing voltage-gated sodium channels to open and allowing an influx of sodium ions into the cell. This results in depolarization of the membrane potential, triggering the propagation of the action potential along the length of the neuron.

An Action Potential in a Neuron Begins When